Fix ZFS quota handling on ops/fs node
We have been setting the ZFS
quota attribute for accounts to reflect the per-user/proj Emulab quota, which is fine unless you want to differentiate the dataset limit (
refquota) from the dataset+snapshots+descendants limit (
quota). Since we are now doing snapshots we want the Emulab quota to be what they can use but have more space available for snapshots.
So, we have to switch to using
Mostly this is just going to be a hassle because of backward compat.